My mid-2015 MBP seems to be in AHCI mode, it has the original 512GB Samsung UBX controller SSD which is certainly NVMe. Where have I gone wrong? : r/macbookpro
Genuine HP Elitebook 820 G3 256GB SATA-3 Opal2 M.2 SSD Hard Drive 860026-001 - Notebookparts.com